Concurrent maintenance of an input/output (I/O) adapter backing a virtual network interface connection (VNIC) including receiving, by a hardware management console (HMC), a request to disconnect the I/O adapter from a computing system, wherein the computing system comprises a logical partition and virtual I/O server; instructing, by the HMC over a communications link, the virtual I/O server to deconfigure and remove the server VNIC driver; determining, by the HMC, that a replacement I/O adapter is installed on the computing system; and in response to determining that the replacement I/O adapter is installed on the computing system, instructing, by the HMC over the communications link, the virtual I/O server to add and configure a replacement server VNIC driver.

Techniques for scalable virtualization of an Input/Output (I/O) device are described. An electronic device composes a virtual device comprising one or more assignable interface (AI) instances of a plurality of AI instances of a hosting function exposed by the I/O device. The electronic device emulates device resources of the I/O device via the virtual device. The electronic device intercepts a request from the guest pertaining to the virtual device, and determines whether the request from the guest is a fast-path operation to be passed directly to one of the one or more AI instances of the I/O device or a slow-path operation that is to be at least partially serviced via software executed by the electronic device. For a slow-path operation, the electronic device services the request at least partially via the software executed by the electronic device.

A method and technique for allocation and balancing of storage resources includes monitoring, for each of a plurality of storage controllers, an input/output (I/O) latency value based on an I/O latency associated with each storage volume controlled by a respective storage controller. A network bandwidth utilization value and a network latency value corresponding to each storage controller is also monitored. An I/O latency value threshold, a network bandwidth utilization threshold, and a network latency value threshold is determined. Responsive to at least one of the I/O latency value, the network bandwidth utilization value and the network latency value for at least one storage controller exceeding a respective threshold, storage volume distribution among the storage controllers is rebalanced.

A method and technique for allocation and balancing of storage resources includes monitoring, for each of a plurality of storage controllers, an input/output (I/O) latency value based on an I/O latency associated with each storage volume controlled by a respective storage controller. A network bandwidth utilization value and a network latency value corresponding to each storage controller is also monitored. An I/O latency value threshold, a network bandwidth utilization threshold, and a network latency value threshold is determined. Responsive to at least one of the I/O latency value, the network bandwidth utilization value and the network latency value for at least one storage controller exceeding a respective threshold, storage volume distribution among the storage controllers is rebalanced.

A system and method for communication link management in a credit-based system is disclosed. In one embodiment, a system includes first and second functional circuit blocks implemented on an integrated circuit and being able to communicate with one another through establishment of source synchronous links. The first functional circuit block includes a write queue for storing data and information regarding write requests sent from the second functional circuit block. The write queue includes credit management circuitry arranged to convey one or more credits to the second functional circuit block responsive to receiving one or more write requests therefrom. Responsive to receiving the one or more credits and in the absence of any pending additional requests, the second functional circuit block may deactivate a link with the first functional circuit block.

A system and method for communication link management in a credit-based system is disclosed. In one embodiment, a system includes first and second functional circuit blocks implemented on an integrated circuit and being able to communicate with one another through establishment of source synchronous links. The first functional circuit block includes a write queue for storing data and information regarding write requests sent from the second functional circuit block. The write queue includes credit management circuitry arranged to convey one or more credits to the second functional circuit block responsive to receiving one or more write requests therefrom. Responsive to receiving the one or more credits and in the absence of any pending additional requests, the second functional circuit block may deactivate a link with the first functional circuit block.

Disclosed are a system comprising a computer-readable storage medium storing at least one program, and a computer-implemented method for event messaging over a network. A subscription interface receives data indicative of a subscription request for sessionized data. An allocation module allocates a sessionizer bank linked to the subscription request. A messaging interface module provisions identifiers linked to the respective processing engines of the sessionizer bank. The messaging interface module registers the allocated sessionizer bank as available to process event messages matching the subscription request by providing the provisioned identifiers. The messaging interface module receives event messages from a producer device linked by a collection server to a selected one of the processing engines of the sessionizer bank. The selected one of the processing engine processes the received event messages in accordance with session rule data linked to the subscription request to generate sessionized data.

Disclosed are a system comprising a computer-readable storage medium storing at least one program, and a computer-implemented method for event messaging over a network. A subscription interface receives data indicative of a subscription request for sessionized data. An allocation module allocates a sessionizer bank linked to the subscription request. A messaging interface module provisions identifiers linked to the respective processing engines of the sessionizer bank. The messaging interface module registers the allocated sessionizer bank as available to process event messages matching the subscription request by providing the provisioned identifiers. The messaging interface module receives event messages from a producer device linked by a collection server to a selected one of the processing engines of the sessionizer bank. The selected one of the processing engine processes the received event messages in accordance with session rule data linked to the subscription request to generate sessionized data.

An interface circuit is provided and includes a first switching device connected to a first power supply node supplying a first voltage, and controlled by a first input signal, a second switching device connected to a second power supply node supplying a second voltage lower than the first voltage, and controlled by a second input signal different from the first input signal, an output node through which the first switching device and the second switching device are connected to each other in series, outputting an output signal, a first resistor connected between the first power supply node and the first switching device, a second resistor connected between the second power supply node and the second switching device, a first capacitor connected to a node between the first resistor and the first switching device, and a second capacitor connected to a node between the second resistor and the second switching device.

An interface circuit is provided and includes a first switching device connected to a first power supply node supplying a first voltage, and controlled by a first input signal, a second switching device connected to a second power supply node supplying a second voltage lower than the first voltage, and controlled by a second input signal different from the first input signal, an output node through which the first switching device and the second switching device are connected to each other in series, outputting an output signal, a first resistor connected between the first power supply node and the first switching device, a second resistor connected between the second power supply node and the second switching device, a first capacitor connected to a node between the first resistor and the first switching device, and a second capacitor connected to a node between the second resistor and the second switching device.